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Studwell, W.E.: Retrieving LC Subject Headings : long chains versus an increased number of headings (1989)
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Studwell, W.E.: ¬The 1990s: Decade of subject access : A theoretical code for LC subject headings would complete the maturation of modern cataloging (1987)
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Studwell, W.E.; Rolland-Thomas, P.: ¬The form and structure of a subject heading code (1988)
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